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17 lines
524 B
17 lines
524 B
7 years ago
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## API
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> 有默认样式，距离底部 `50px`，可覆盖。
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>
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> 自定义样式宽高不大于 40px \* 40px。
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| 参数 | 说明 | 类型 | 默认值 |
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| --- | --- | --- | --- |
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| target | 设置需要监听其滚动事件的元素，值为一个返回对应 DOM 元素的函数 | Function | () => window |
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| visibilityHeight | 滚动高度达到此参数值才出现 `BackTop` | number | 400 |
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### 事件
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| 事件名称 | 说明 | 回调参数 |
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| --- | --- | --- |
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| click | 点击按钮的回调函数 | Function |
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